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Normal is whatever the PCM sets LTFT. Factory reference is zero percent. If not zero then the PCM has set a STFT value as long term. STFT varies as to oxygen sensor voltage values and MAF/MAP. If the value exceeds a threshold then STFT becomes LTFT and is stored in the PCM. STFT is temporary and not stored. Add fuel are + percentages. Remove fuel are - percentages LTFT and STFT.

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Q: What is the normal long term fuel trim at idle on a 1998 Ford Escort SE?
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